particulate pollutants
Recently Published Documents

Background and objective: Illegal open-air incineration, which is criticized as a leading source of air pollutants among agricultural activities, currently requires constant effort and attention. Countries around the world have been undertaking studies on the emission of heavy metal substances in fine dust discharged during the incineration process. A precise analytical method is required to examine the harmful effects of particulate pollutants on the human body.Methods: In order to simulate open-air incineration, the infrastructure needed for incineration tests complying with the United States Environmental Protection Agency (EPA) Method 5G was built, and a large-area analysis was conducted on particulate pollutants through automated scanning electron microscopy (SEM)-energy-dispersive X-ray spectroscopy (EDS). For the test specimen, high-density polyethylene (HDPE) waste collected by the DangJin Office located in Choongcheongnam-do was used. To increase the identifiability of the analyzed particles, the incineration experiment was conducted in an incinerator three times after dividing the film waste into 200 g specimens.Results: Among the metal particulate matters detected in the HDPE waste incineration test, transition metals included C (20.8-37.1 wt%) and O (33.7-37.9 wt%). As for other chemical matters, the analysis showed that metal particulate matters such as metalloids, alkali metals, alkaline earth metals, and transition metals reacted to C and C-O. Si, a representative metalloid, was detected at 14.8-20.8 wt%, showing the highest weight ratio except for C and O.Conclusion: In this study, the detection of metal chemicals in incinerated particulate matters was effectively confirmed through SEM-EDS. The results of this study verified that HDPE waste adsorbs metal chemicals originating from soil due to its own properties and deterioration, and that when incinerated, it emits particulate matters containing transition metals and other metals that contribute to the excessive production and reduction of reactive oxygen species.

Intisari Selama ini Jakarta dikenal dengan kota berpolusi dengan indeks pencemaran udara yang cukup tinggi. Salah satu penyebab pencemaran udara adalah polutan partikulat (PM2.5) dan gas CO yang berasal dari pembakaran tidak sempurna. Pada masa pandemi Covid-19, pemerintah menerapkan  kebijakan Pemberlakuan Pembatasan Kegiatan Masyarakat (PPKM) untuk menekan jumlah penularan virus Covid-19. Jakarta Pusat sebagai salah satu kota yang melaksanakan kebijakan PPKM mewajibkan perkantoran yang ada untuk menerapkan Work From Home (WFH). Jumlah konsentrasi polusi udara PM2.5 pada periode WFH Maret 2020 tidak jauh berbeda dibandingkan lima tahun sebelumnya. Sedangkan konsentrasi CO pada periode yang sama mengalami penurunan dibandingkan lima tahun sebelumnya. Hasil analisis hubungan antara pengaruh parameter cuaca dengan konsentrasi polutan menunjukkan pengaruh parameter cuaca kurang signifikan terhadap konsentrasi PM2.5 dan gas CO. Nilai R-Square adj antara beberapa parameter cuaca terhadap konsentrasi PM2.5 dan konsentrasi CO cukup kecil. Hal ini menunjukkan bahwa pengurangan nilai konsentrasi PM2.5 dan gas CO bukan dipengaruhi oleh parameter cuaca. Faktor lain yang diduga memengaruhi konsentrasi PM2.5 dan gas CO adalah kegiatan manusia seperti WFH sehingga terjadi pengurangan aktivitas masyarakat untuk pergi ke kantor. Abstract Jakarta is known as a polluted city with a high air pollution index. One of the air pollution causes is particulate pollutants (PM2.5) and CO from incomplete combustion. During the Covid-19 pandemic, the government implemented a policy of Community Activity Restrictions, known as PPKM, to reduce the number of transmissions of the Covid-19. As one of the cities implementing the PPKM policy, Central Jakarta requires offices to implement Work From Home (WFH). The total PM2.5 air pollution concentration in the March 2020 WFH period was not much different from the previous five years. However, the CO concentration in the same period decreased compared to the last five years. Relationship analysis between the influence of weather parameters and pollutant concentrations shows that weather parameters are less significant on PM2.5 and CO concentration. The R-Square adj between several weather parameters on the concentration of PM2.5 and the concentration of CO is small. It means that weather parameters do not influence the reduction in the concentration of PM2.5 and CO. It is assumed that the PM2.5 and CO concentrations decreased due to fewer human activities in the office and public areas.

Abstract For improving the collection efficiency of electrostatic precipitator (EP) in the pigsty, MATLAB & Finite element method (FEM) is applied to calculate RNG k-ε equations, corona equation and acoustic radiation equations to analyze sound field, electric field and particle trajectory in the wire-plate EP. The results show that fine particle agglomeration can be induced, so as to promote the enlargement of fine particles and improve the capture efficiency of fine particles at acoustic node area. Moreover, the particle distribution can be controlled according to the above V-η curve in the pigsty. In addition, η initially increases, and then decreases in the range of f from 1000 Hz to 2000 Hz. Therefore, the linear variation law of V– η & SPL – η & f – η provide scientific control method for the construction of green and efficient removal technology of particulate pollutants in the piggery.

In 2018, 3.8 million premature deaths were attributed to exposure to biomass burning nanoparticles from wood combustion. The objective of this study was to investigate and compare the toxic effect of wood-combustion-related biomass burning nanoparticles from three different combustion stages (i.e., flaming, smoldering, and pyrolysis) on alveolar lung cells, by studying cell proliferation, and structural and behavioral parameters. A549 lung epithelial cells were treated with 31, 62, 125, 250, and 500 µg/mL of water-soluble particulate pollutants from wood burning, and measured by means of real-time cell analysis, cell imaging, and phase imaging microscopy. At low concentrations (31 and 62 µg/mL), all three types of wood burning samples exhibited no toxicity. At 125 µg/mL, they caused decreased cell proliferation compared to the control. Exposure to higher concentrations (250 and 500 µg/mL) killed the cells. Cell physical parameters (area, optical volume, eccentricity, perimeter, and optical thickness) and behavioral parameters (migration, motility, and motility speed) did not change in response to exposure to wood burning materials up to a concentration of 125 µg/mL. Exposure to higher concentrations (250 and 500 µg/mL) changed cell perimeter, optical thickness for smoldering and flaming particles, and led to decreased migration, motility, and motility speed of cells. In conclusion, all three of the combustion water-soluble organic pollutants were identified as equally toxic by real-time cell analysis (RTCA) results. The parameters describing cell structure suggest that pyrolysis particles were slightly less toxic than others.